Sajin Komatsuna, real name "Hybrid C 7.1 x F 2.1", is Ryuuhei's puppy and one of the hybrids who serves as main characters of the roleplay "Bleach: Hybrid Theory", created by Mayuri from the DNA of Sajin Komamura and Yoruichi Shihoin. Closer to Komamura's race, Sajin is actually a wolf-like creature, giving her a faster aging than most hybrid but her intelligence is far more dog-like than the other and because of this she is deemed a failure.

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Komatsuna took a mix of her "mother"'s beauty along with some animalistic traits of her "father", she is a rather volutuous and curvaceous woman in black hair with a light purple tint, golden eyes and, unlike Yoruichi, a peach complexion and a lovely heart-shaped face. Her most curious traits are the ones belonging to a beastkin, as she has two wolf-like ears instead of regular ones, not to say a wolf like tail she seems to wag when anxious.

When dressing, she has four noticeable outfits: the standard Shinigami outfit, which is costumized to leave shoulder and back exposed and it's kept together with a collar (again, to use shrunko), the assassination squad outfit (like the one led by Sui Feng), a standard shinigami student outfit with a few costumization like a green clothespin in her skirt and, her most basic and casual outfit, a revealing red dress which exposes shoulder, back and some cleavage alongside a white short skirt (although it's very rare for her to wear it, she does only at home, pretty much)

Komatsuna is a girl which lives every day a facade. She often acts like, shall we say, a bimbo. She has a bubbly and cheerful, if not a bit ditzy, personality, she is nice, but doesn't look the sharpest tool in the shred, and seems mostly to use her beauty to get what she wants rather than her wits or skills. Already this, however, she is not without great values, like her unfaltering loyalty, her love of teamwork. However, this bimbo personality is nothing more but an act, caused by her trying to be more pleasant to people when she wants to be friendly or to lure her foes into a sense of false reassurance, being quite the opposite, a distanced, yet somewhat romantic (not as in romance, but the beauty of nature), and a puppy-like innocence, followed by a melancholic law of the strongest. Now that she learnt to shift between human and wolf form, she is trying to learn to act among humans, sometimes unable not to feel like a fish out of water, therefore she puts on puppy eyes and tries to keep her innocence, still amazed by humanity.

Note: due to her personality, it's been decided the background would be written as if it were a children's story

This is the story of a special little wolf pup against the nature and the elements until she found her true self and gained humanity... somehow. You see, this was a special puppy, because she remembers not neither her mother or little siblings, if she had any. Her earliest memory is her in a bag to be drowned. Apparently, Mayuri, when experimenting on the DNA on Yoruichi and Komamura, had obtained her in wolf form and, seeing her as nothing more but a mere wolf instead of a Shinigami, thinking her unable to do much (it was renown Yoruichi's animal form was much weaker than the original, not to say the subject acted more like a dog rather than a person) deemed her a failure...and let's say he didn't take middle measures in trying to get rid of her.

Struggling for life to avoid drowining, she managed to activate her reiatsu which with a moderate burst loosened the bag opening allowing the pup to escape death that one day, lost in the forests of Soul Societies. Already there, she was what most would say a lone wolf (forgive the lame pun), mostly alone and fighting every day for survival, remaining hidden and preying on the smaller creatures to surive. Yet, as this was a little special puppy, as we know, the forest was to little, and the big adventure began as she travelled across the woods.

Due to her special soul, however, she was often hunted down by hollows, monsters in a white mask (and worse, some looked like cats. Grrr... cats...) and were always trying to eat the poor puppy, sadly enough. But she was not anymore unexperienced and, therefore, she often fought back, ended up even getting sometimes hollows not just to retreat, but even to break the mask of a few, killing them in the process. However, this was not always possible, as she was, special or not, a little pup, while some of these monsters roaming around the villages were occasionally even bigger than the rocks and the caves she usually hid in and, one day, poor her, she nearly risked to die, but here came what would have been her best friend, Ryuuhei Fujiii. That day, indeed, the Shinigami was patrolling the area and, having hunted down the very hollow which was about to kill our fluffy heroine because of having attacked a village, succesfully took it down, but didn't notice that something had slipped in his backpack.

All it took to Komatsuna to conquer Ryuuhei's heart was a little innocent stare

Finding the little wolf pup in his pack resting peacefully, would have been the first surprise Ryuuhei would have gotten as he decided to keep her as a pet. Indeed, more in contact with people, our special pup was somehow trying to comically imitate her by trying to stand on her hind legs or eat on a table or other things, while her bond with Ryuuhei grew, as he often carried her around and spoke to her all the time, to the point she was given the name Komatsuna due to one of her favorite food, a special kind of turnip (usually accompained with meat), to the point that, one day, to impress him, she showed off a little trick she had learnt and spoke back, helloing him, which would have been his second big surprise. Due to his freak out, she rarely spoke back to him, only doing so when he was sleeping or giving him small answers ('Yes', 'No' and such)

While she often had difficulty at the beginning to say more than a complete sentence, but trying to learn more and more, one day she ended up meeting a drunken student of the Academy. At first barking, panicking at how he didn't seem scared, our special puppy ended up out of panic showing off her vocabulary and skills by ending up pronuncing an entire Kido formula she had heard by some kido practioner (A level one Bakudo, nothing more) and taking from him his Asauchi. Despite all the attempts of the student to get it back, between the fact the immature sword seemed to have bonded to her and Ryuuhei, the story ended with him having to get another sword and her happily getting her new toy.

And, as the final surprise, even to Komatsuna as well, one day while concentrating to try and make other Kido spells (always Bakudo) she got frustrated and inwardly wished for herself to have a better body to make these spells and, believe it or not, her wish got granted: after all, she was a special pup, being actually an hybrid shinigami, which was the reason why she could act so human and be so proficent at skills as Kido or just speak. A bit awkward for Ryuuhei was the moment that, instead of his pet, was pounced by a naked woman with wolf ears and tails trying to lick his cheek.

As the misunderstanding got cleared, the next step was obvious, and thanks to Ryuuhei, she got in the Shino Academy, under the last name of Sajin, thanks to Komamura deciding to be of help (after all, it was weird a girl all of sudden had animal traits, and he wanted to make sure she was still as respected as he was). Since then, she had been studying diligently, having set her aims to the Second Division because of being for some reason drawn to its captain and because she agreed to the predatory mindset the division had, and already has gotten an acceptance letter due to her scores in Hoho and Hakuda, and also training with her former owner and now current roomate Ryuuhei, trying to learn more and more how to be human. And everyone lived happily every after.

Hybrid Skills: Komatsuna is Komamura and Yoruichi's hybrid, and has a mix of both her ability, which however means that she is weakened as soon as she is in proximity with either. Some of her most notable inherted abilities are the following

Human Transformation: Like Yoruichi can turn into a cat, Komatsuna can take a human form where she can use much more reiatsu and power, as it is far more mature than her still young puppy form. Her Wolf form is much weaker, unable to cast most of the kido spells she knows (even a level one can put a strain on her), slowing down her shunpo, unable to use shrunko and do Bankai

Hand to Hand Combat: Having partially taken Komamura's physical strength, slightly weakened by her waifish physique and Yoruich's speed, Komatsuna is rather decently skilled at hand to hand combat, although she is likely to use both her nails and fangs, just as if she were a wolf

High Reiatsu Level: Her reiatsu comes from two powerful captains, which would imply her reaitsu is above average. However, they are far from the greatest in term of sheer raw power.

Heightened Physical Stength: One of the shinigami she comes from is one of the most physically powerful and through the other, a master of fighting, she knows how to control her above average strength. She is still has waifish physique, and because of this and her relative average reiatsu, she can't take many hits, mostly relying like her father in quick attacks, mostly dodging as she tries to wear the opponent down to finish own

Shunpo User: Komatsuna is among the fastest hybrids of the series due to one of the being the Goddess of Flash

Kido Pratictioner: Komatsuna is rather skilled in Kido spells, her speciality being Bakudo, Binding spells, being even able to cast a few low level tricks in her much weaker puppy form.

Shunko: Komatsuna is praticing Shunko, a technique developed by Yoruichi, to mix her greatest strengths: Hakuda and Kido. However, she has yet to make it at full power.

Amaterasu Spirit, an hybrid between Komatsuna's wolf and human forms

Zanpakuto: The name of the Zanpakuto is called Ameterasu, not unlike the Sun deity in Japan. The zanpakuto is a bit shorter than average, looking like a bastard version of a tanto and a katana, the blade being rather simple, but the handle being quite elaborate, with a black, gold fuschia color scheme rather intricate, while the hilt looks like to have a flower motif engraved.

The inner world is a white void, with no friction ro gravity, making sometimes the sense of orientation somewhat screwy, with occasional sun motif where her spirit resides This spirit resembled a white haired miko, with a pale complexion and white hair wearing a wood with two points resembling wolf-like ears, her dress looking to be fading at the extremities as if they were cloud, no sleeve and sporting off cleavage, showing to have red tattoes or marking. On her back, there is a giant obelisk shaped like a sun floating a few inches away from her. Her personality is very quiet and caqlm, never raising voice, yet possesses a child like innocence in everything she does, sometimes looking even unaware of the concept of killing.

The command of Komatsuna's zanpakuto is 'Shine, Ameratsu'

Shikai: The swords, like most, changes, turning into a snow white whip with red stripes, shaped slightly like a cloud, or, even better, a bit like Komatsuna's very tail. Unlike most whip, this has a complex handle which ties it to her wrist, resembling Sui Feng's shikai

Her Shikai, unlike mosts, already starts to slightly change her appearence, giving her subtler wolf-like mark, including hints of fangs and marks on her cheeks. This is a Shikai that, unlike the one of her old man, has a specific point of origin, the one of her tail. Essentially, moving her body, she generates several, mechanical looking tendrils she moves with her limbs, whip or tail. Because of this the technique is nicknamed Uragiri Okami (Dance Of The Threacherous Wolf). She has a relative control of the tails, able to maipulate not much the lenght rather than their girth and movement at will. They can be used especially as a form of attack, but combined to Shrunko they form a relative defense.

Unlike her bankai, she can switch to her animal form in shikai. In that case the tendil and her zanpakuto is temporarily merged with her tail. However, switching to this form she loses a lot of her reiatsu, therefore it's little more than a drastic escape route

Komatsuna's fake Bankai

FakeBankai - Ameramagedon (a portemateau of Ameratsu and Armageddon). This form is all in all a copy of the one of her father except that, unlike her father, who made a 330 feet tall giant Samurai, she evokes a relatively shorter (165 feet tall) ninja, sleeker and much lankier than her, just like she is smaller and much less bulky than Komamura. To further reflect the differences, while Komamura's bankai is slow, yet very powerfuls, hers is incredibly fast but not very powerful, using as a strategy to avoid her opponent and try to strike him. It's FAR FAR more fragile than it seems. Indeed, as I wrote, this is a fake bankai, as it can be already undestood by the following things:

She can control it just by moving her tail

Her zanpakuto doesn't change from her shikai form

The tails which appeared on her shikai aren't there, further hinting this is not an evolution of her bankai

There is no further change of her physical appearence

Ameramagedon is NOT a japanese word

She doesn't take damage by it being damaged

It's really much weaker than it looks

This fake bankai serves actually as a distraction for her kill, as equally she is still as strong as her shikai form, which then leads to the actual bankai

Bankai:Tentayio Okami Ameratsu (A pun, serving as 'Wolf of Heavenly Sun Ameratsu' or 'God of Heavenly Sun Ameratsu). First of all this bankai, being all going out, always open with her going a more wolf like form, growing eight other tails, her getting slitted pupils, her marks becoming more evident and growing patches fo fur and claws, as if it were an hybrid form, and howls as it to summon her Bankai (which, in case of her fake one, is shred apart from within): a sleek black and red mechanical looking wolf, inspired to her animal form.

As she switches to this, she usually jumps atop the head and sits down in a meditating pose where she can use her whip, tails and arms to switch pose and command the new construct. If someone was to scratch it, it would notice that unlike Komamura's bankai, this wolf is mostly hollow and that, after a first layer of plates resembling the samurai armor, inside there is mostly lots of reiatsu building up, which is the base of her power for when she uses shrunko. And gives the base form of attack in her form when her bankai scratches or bites her enemies.

Indeed, by doing so, not only her bankai becomes more resistant and faster, like an actual shrunko, but when first activated, it releases a large wave of reiatsu which can either knock away or destroy weak enemies (weak as in unseated members or standard hollows).

Like Komamura's bankai, her body and her bankai are a reflection, therefore the wounds she gets are reflected on her bankai and vice versa, allowing her to also repair it as she gets healed.

Komatsuna's theme is the music played during dog ending from Silent Hill 2

Her birthday is the Global Animal Care Day

Komatsuna's human design is inspired by Ahri the Ninetails from the MOBA game League of Legend, while her design was inspired from Chibiterasu from Okami.

Komatsuna is the only one among the OC to seem to be unable to understand that Yoru is a loner who doesn't like company, always calling him 'friend' and treating him like such, no matter how harsh he treats her.